package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

//拦截所有
public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    //前置拦截器
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /*//1.获取session
        HttpSession session = request.getSession();*/
        //1.获取请求头的token
        String token = request.getHeader("authorization");

        /*//2.获取session的用户
        Object user = session.getAttribute("user");*/
        //2.基于token获取redis中的用户
        if (StrUtil.isBlank(token)) {
            /*//不存在，拦截，返回401
            response.setStatus(401);
            return false;*/
            //不做拦截
            return true;
        }

        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);


        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            /*//4.不存在，拦截，返回401
            response.setStatus(401);
            return false;*/
            //不做拦截
            return true;
        }

        //5.将获取到的Hash数据-->userDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        //7.刷新token有效期
        stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);

        //8.放行
        return true;
    }

    //后置拦截器
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
